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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/module.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/igmp.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/seqlock.h>
  16 #include <linux/init.h>
  17 #include <net/snmp.h>
  18 #include <net/icmp.h>
  19 #include <net/ip.h>
  20 #include <net/route.h>
  21 #include <net/tcp.h>
  22 #include <net/udp.h>
  23 #include <net/cipso_ipv4.h>
  24 #include <net/inet_frag.h>
  25
  26 static int zero;
  27 static int tcp_retr1_max = 255;
  28 static int ip_local_port_range_min[] = { 1, 1 };
  29 static int ip_local_port_range_max[] = { 65535, 65535 };
  30
  31 extern seqlock_t sysctl_port_range_lock;
  32 extern int sysctl_local_port_range[2];
  33
  34 /* Update system visible IP port range */
  35 static void set_local_port_range(int range[2])
  36 {
  37         write_seqlock(&sysctl_port_range_lock);
  38         sysctl_local_port_range[0] = range[0];
  39         sysctl_local_port_range[1] = range[1];
  40         write_sequnlock(&sysctl_port_range_lock);
  41 }
  42
  43 /* Validate changes from /proc interface. */
  44 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
  45                                  void __user *buffer,
  46                                  size_t *lenp, loff_t *ppos)
  47 {
  48         int ret;
  49         int range[2] = { sysctl_local_port_range[0],
  50                          sysctl_local_port_range[1] };
  51         ctl_table tmp = {
  52                 .data = &range,
  53                 .maxlen = sizeof(range),
  54                 .mode = table->mode,
  55                 .extra1 = &ip_local_port_range_min,
  56                 .extra2 = &ip_local_port_range_max,
  57         };
  58
  59         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
  60
  61         if (write && ret == 0) {
  62                 if (range[1] < range[0])
  63                         ret = -EINVAL;
  64                 else
  65                         set_local_port_range(range);
  66         }
  67
  68         return ret;
  69 }
  70
  71 /* Validate changes from sysctl interface. */
  72 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
  73                                          int nlen, void __user *oldval,
  74                                          size_t __user *oldlenp,
  75                                         void __user *newval, size_t newlen)
  76 {
  77         int ret;
  78         int range[2] = { sysctl_local_port_range[0],
  79                          sysctl_local_port_range[1] };
  80         ctl_table tmp = {
  81                 .data = &range,
  82                 .maxlen = sizeof(range),
  83                 .mode = table->mode,
  84                 .extra1 = &ip_local_port_range_min,
  85                 .extra2 = &ip_local_port_range_max,
  86         };
  87
  88         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
  89         if (ret == 0 && newval && newlen) {
  90                 if (range[1] < range[0])
  91                         ret = -EINVAL;
  92                 else
  93                         set_local_port_range(range);
  94         }
  95         return ret;
  96 }
  97
  98
  99 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
 100                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 101 {
 102         char val[TCP_CA_NAME_MAX];
 103         ctl_table tbl = {
 104                 .data = val,
 105                 .maxlen = TCP_CA_NAME_MAX,
 106         };
 107         int ret;
 108
 109         tcp_get_default_congestion_control(val);
 110
 111         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 112         if (write && ret == 0)
 113                 ret = tcp_set_default_congestion_control(val);
 114         return ret;
 115 }
 116
 117 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 118                                          int nlen, void __user *oldval,
 119                                          size_t __user *oldlenp,
 120                                          void __user *newval, size_t newlen)
 121 {
 122         char val[TCP_CA_NAME_MAX];
 123         ctl_table tbl = {
 124                 .data = val,
 125                 .maxlen = TCP_CA_NAME_MAX,
 126         };
 127         int ret;
 128
 129         tcp_get_default_congestion_control(val);
 130         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 131         if (ret == 1 && newval && newlen)
 132                 ret = tcp_set_default_congestion_control(val);
 133         return ret;
 134 }
 135
 136 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 137                                                  int write, struct file * filp,
 138                                                  void __user *buffer, size_t *lenp,
 139                                                  loff_t *ppos)
 140 {
 141         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 142         int ret;
 143
 144         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 145         if (!tbl.data)
 146                 return -ENOMEM;
 147         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 148         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 149         kfree(tbl.data);
 150         return ret;
 151 }
 152
 153 static int proc_allowed_congestion_control(ctl_table *ctl,
 154                                            int write, struct file * filp,
 155                                            void __user *buffer, size_t *lenp,
 156                                            loff_t *ppos)
 157 {
 158         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 159         int ret;
 160
 161         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 162         if (!tbl.data)
 163                 return -ENOMEM;
 164
 165         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 166         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 167         if (write && ret == 0)
 168                 ret = tcp_set_allowed_congestion_control(tbl.data);
 169         kfree(tbl.data);
 170         return ret;
 171 }
 172
 173 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 174                                                int nlen, void __user *oldval,
 175                                                size_t __user *oldlenp,
 176                                                void __user *newval,
 177                                                size_t newlen)
 178 {
 179         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 180         int ret;
 181
 182         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 183         if (!tbl.data)
 184                 return -ENOMEM;
 185
 186         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 187         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 188         if (ret == 0 && newval && newlen)
 189                 ret = tcp_set_allowed_congestion_control(tbl.data);
 190         kfree(tbl.data);
 191
 192         return ret;
 193
 194 }
 195
 196 static struct ctl_table ipv4_table[] = {
 197         {
 198                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 199                 .procname       = "tcp_timestamps",
 200                 .data           = &sysctl_tcp_timestamps,
 201                 .maxlen         = sizeof(int),
 202                 .mode           = 0644,
 203                 .proc_handler   = &proc_dointvec
 204         },
 205         {
 206                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 207                 .procname       = "tcp_window_scaling",
 208                 .data           = &sysctl_tcp_window_scaling,
 209                 .maxlen         = sizeof(int),
 210                 .mode           = 0644,
 211                 .proc_handler   = &proc_dointvec
 212         },
 213         {
 214                 .ctl_name       = NET_IPV4_TCP_SACK,
 215                 .procname       = "tcp_sack",
 216                 .data           = &sysctl_tcp_sack,
 217                 .maxlen         = sizeof(int),
 218                 .mode           = 0644,
 219                 .proc_handler   = &proc_dointvec
 220         },
 221         {
 222                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 223                 .procname       = "tcp_retrans_collapse",
 224                 .data           = &sysctl_tcp_retrans_collapse,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = &proc_dointvec
 228         },
 229         {
 230                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 231                 .procname       = "ip_default_ttl",
 232                 .data           = &sysctl_ip_default_ttl,
 233                 .maxlen         = sizeof(int),
 234                 .mode           = 0644,
 235                 .proc_handler   = &ipv4_doint_and_flush,
 236                 .strategy       = &ipv4_doint_and_flush_strategy,
 237         },
 238         {
 239                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 240                 .procname       = "ip_no_pmtu_disc",
 241                 .data           = &ipv4_config.no_pmtu_disc,
 242                 .maxlen         = sizeof(int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &proc_dointvec
 245         },
 246         {
 247                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 248                 .procname       = "ip_nonlocal_bind",
 249                 .data           = &sysctl_ip_nonlocal_bind,
 250                 .maxlen         = sizeof(int),
 251                 .mode           = 0644,
 252                 .proc_handler   = &proc_dointvec
 253         },
 254         {
 255                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 256                 .procname       = "tcp_syn_retries",
 257                 .data           = &sysctl_tcp_syn_retries,
 258                 .maxlen         = sizeof(int),
 259                 .mode           = 0644,
 260                 .proc_handler   = &proc_dointvec
 261         },
 262         {
 263                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 264                 .procname       = "tcp_synack_retries",
 265                 .data           = &sysctl_tcp_synack_retries,
 266                 .maxlen         = sizeof(int),
 267                 .mode           = 0644,
 268                 .proc_handler   = &proc_dointvec
 269         },
 270         {
 271                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 272                 .procname       = "tcp_max_orphans",
 273                 .data           = &sysctl_tcp_max_orphans,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec
 277         },
 278         {
 279                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 280                 .procname       = "tcp_max_tw_buckets",
 281                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 282                 .maxlen         = sizeof(int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec
 285         },
 286         {
 287                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 288                 .procname       = "ipfrag_high_thresh",
 289                 .data           = &ip4_frags_ctl.high_thresh,
 290                 .maxlen         = sizeof(int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec
 293         },
 294         {
 295                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 296                 .procname       = "ipfrag_low_thresh",
 297                 .data           = &ip4_frags_ctl.low_thresh,
 298                 .maxlen         = sizeof(int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec
 301         },
 302         {
 303                 .ctl_name       = NET_IPV4_DYNADDR,
 304                 .procname       = "ip_dynaddr",
 305                 .data           = &sysctl_ip_dynaddr,
 306                 .maxlen         = sizeof(int),
 307                 .mode           = 0644,
 308                 .proc_handler   = &proc_dointvec
 309         },
 310         {
 311                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 312                 .procname       = "ipfrag_time",
 313                 .data           = &ip4_frags_ctl.timeout,
 314                 .maxlen         = sizeof(int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &proc_dointvec_jiffies,
 317                 .strategy       = &sysctl_jiffies
 318         },
 319         {
 320                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 321                 .procname       = "tcp_keepalive_time",
 322                 .data           = &sysctl_tcp_keepalive_time,
 323                 .maxlen         = sizeof(int),
 324                 .mode           = 0644,
 325                 .proc_handler   = &proc_dointvec_jiffies,
 326                 .strategy       = &sysctl_jiffies
 327         },
 328         {
 329                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 330                 .procname       = "tcp_keepalive_probes",
 331                 .data           = &sysctl_tcp_keepalive_probes,
 332                 .maxlen         = sizeof(int),
 333                 .mode           = 0644,
 334                 .proc_handler   = &proc_dointvec
 335         },
 336         {
 337                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 338                 .procname       = "tcp_keepalive_intvl",
 339                 .data           = &sysctl_tcp_keepalive_intvl,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec_jiffies,
 343                 .strategy       = &sysctl_jiffies
 344         },
 345         {
 346                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 347                 .procname       = "tcp_retries1",
 348                 .data           = &sysctl_tcp_retries1,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = &proc_dointvec_minmax,
 352                 .strategy       = &sysctl_intvec,
 353                 .extra2         = &tcp_retr1_max
 354         },
 355         {
 356                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 357                 .procname       = "tcp_retries2",
 358                 .data           = &sysctl_tcp_retries2,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dointvec
 362         },
 363         {
 364                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 365                 .procname       = "tcp_fin_timeout",
 366                 .data           = &sysctl_tcp_fin_timeout,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dointvec_jiffies,
 370                 .strategy       = &sysctl_jiffies
 371         },
 372 #ifdef CONFIG_SYN_COOKIES
 373         {
 374                 .ctl_name       = NET_TCP_SYNCOOKIES,
 375                 .procname       = "tcp_syncookies",
 376                 .data           = &sysctl_tcp_syncookies,
 377                 .maxlen         = sizeof(int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec
 380         },
 381 #endif
 382         {
 383                 .ctl_name       = NET_TCP_TW_RECYCLE,
 384                 .procname       = "tcp_tw_recycle",
 385                 .data           = &tcp_death_row.sysctl_tw_recycle,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec
 389         },
 390         {
 391                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 392                 .procname       = "tcp_abort_on_overflow",
 393                 .data           = &sysctl_tcp_abort_on_overflow,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = &proc_dointvec
 397         },
 398         {
 399                 .ctl_name       = NET_TCP_STDURG,
 400                 .procname       = "tcp_stdurg",
 401                 .data           = &sysctl_tcp_stdurg,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dointvec
 405         },
 406         {
 407                 .ctl_name       = NET_TCP_RFC1337,
 408                 .procname       = "tcp_rfc1337",
 409                 .data           = &sysctl_tcp_rfc1337,
 410                 .maxlen         = sizeof(int),
 411                 .mode           = 0644,
 412                 .proc_handler   = &proc_dointvec
 413         },
 414         {
 415                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 416                 .procname       = "tcp_max_syn_backlog",
 417                 .data           = &sysctl_max_syn_backlog,
 418                 .maxlen         = sizeof(int),
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dointvec
 421         },
 422         {
 423                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 424                 .procname       = "ip_local_port_range",
 425                 .data           = &sysctl_local_port_range,
 426                 .maxlen         = sizeof(sysctl_local_port_range),
 427                 .mode           = 0644,
 428                 .proc_handler   = &ipv4_local_port_range,
 429                 .strategy       = &ipv4_sysctl_local_port_range,
 430         },
 431         {
 432                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 433                 .procname       = "icmp_echo_ignore_all",
 434                 .data           = &sysctl_icmp_echo_ignore_all,
 435                 .maxlen         = sizeof(int),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec
 438         },
 439         {
 440                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 441                 .procname       = "icmp_echo_ignore_broadcasts",
 442                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dointvec
 446         },
 447         {
 448                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 449                 .procname       = "icmp_ignore_bogus_error_responses",
 450                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = &proc_dointvec
 454         },
 455         {
 456                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 457                 .procname       = "icmp_errors_use_inbound_ifaddr",
 458                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = &proc_dointvec
 462         },
 463         {
 464                 .ctl_name       = NET_IPV4_ROUTE,
 465                 .procname       = "route",
 466                 .maxlen         = 0,
 467                 .mode           = 0555,
 468                 .child          = ipv4_route_table
 469         },
 470 #ifdef CONFIG_IP_MULTICAST
 471         {
 472                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 473                 .procname       = "igmp_max_memberships",
 474                 .data           = &sysctl_igmp_max_memberships,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec
 478         },
 479
 480 #endif
 481         {
 482                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 483                 .procname       = "igmp_max_msf",
 484                 .data           = &sysctl_igmp_max_msf,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dointvec
 488         },
 489         {
 490                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 491                 .procname       = "inet_peer_threshold",
 492                 .data           = &inet_peer_threshold,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec
 496         },
 497         {
 498                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 499                 .procname       = "inet_peer_minttl",
 500                 .data           = &inet_peer_minttl,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = &proc_dointvec_jiffies,
 504                 .strategy       = &sysctl_jiffies
 505         },
 506         {
 507                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 508                 .procname       = "inet_peer_maxttl",
 509                 .data           = &inet_peer_maxttl,
 510                 .maxlen         = sizeof(int),
 511                 .mode           = 0644,
 512                 .proc_handler   = &proc_dointvec_jiffies,
 513                 .strategy       = &sysctl_jiffies
 514         },
 515         {
 516                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 517                 .procname       = "inet_peer_gc_mintime",
 518                 .data           = &inet_peer_gc_mintime,
 519                 .maxlen         = sizeof(int),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec_jiffies,
 522                 .strategy       = &sysctl_jiffies
 523         },
 524         {
 525                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 526                 .procname       = "inet_peer_gc_maxtime",
 527                 .data           = &inet_peer_gc_maxtime,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec_jiffies,
 531                 .strategy       = &sysctl_jiffies
 532         },
 533         {
 534                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 535                 .procname       = "tcp_orphan_retries",
 536                 .data           = &sysctl_tcp_orphan_retries,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = &proc_dointvec
 540         },
 541         {
 542                 .ctl_name       = NET_TCP_FACK,
 543                 .procname       = "tcp_fack",
 544                 .data           = &sysctl_tcp_fack,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec
 548         },
 549         {
 550                 .ctl_name       = NET_TCP_REORDERING,
 551                 .procname       = "tcp_reordering",
 552                 .data           = &sysctl_tcp_reordering,
 553                 .maxlen         = sizeof(int),
 554                 .mode           = 0644,
 555                 .proc_handler   = &proc_dointvec
 556         },
 557         {
 558                 .ctl_name       = NET_TCP_ECN,
 559                 .procname       = "tcp_ecn",
 560                 .data           = &sysctl_tcp_ecn,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec
 564         },
 565         {
 566                 .ctl_name       = NET_TCP_DSACK,
 567                 .procname       = "tcp_dsack",
 568                 .data           = &sysctl_tcp_dsack,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec
 572         },
 573         {
 574                 .ctl_name       = NET_TCP_MEM,
 575                 .procname       = "tcp_mem",
 576                 .data           = &sysctl_tcp_mem,
 577                 .maxlen         = sizeof(sysctl_tcp_mem),
 578                 .mode           = 0644,
 579                 .proc_handler   = &proc_dointvec
 580         },
 581         {
 582                 .ctl_name       = NET_TCP_WMEM,
 583                 .procname       = "tcp_wmem",
 584                 .data           = &sysctl_tcp_wmem,
 585                 .maxlen         = sizeof(sysctl_tcp_wmem),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec
 588         },
 589         {
 590                 .ctl_name       = NET_TCP_RMEM,
 591                 .procname       = "tcp_rmem",
 592                 .data           = &sysctl_tcp_rmem,
 593                 .maxlen         = sizeof(sysctl_tcp_rmem),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec
 596         },
 597         {
 598                 .ctl_name       = NET_TCP_APP_WIN,
 599                 .procname       = "tcp_app_win",
 600                 .data           = &sysctl_tcp_app_win,
 601                 .maxlen         = sizeof(int),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec
 604         },
 605         {
 606                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 607                 .procname       = "tcp_adv_win_scale",
 608                 .data           = &sysctl_tcp_adv_win_scale,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec
 612         },
 613         {
 614                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 615                 .procname       = "icmp_ratelimit",
 616                 .data           = &sysctl_icmp_ratelimit,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec
 620         },
 621         {
 622                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 623                 .procname       = "icmp_ratemask",
 624                 .data           = &sysctl_icmp_ratemask,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec
 628         },
 629         {
 630                 .ctl_name       = NET_TCP_TW_REUSE,
 631                 .procname       = "tcp_tw_reuse",
 632                 .data           = &sysctl_tcp_tw_reuse,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec
 636         },
 637         {
 638                 .ctl_name       = NET_TCP_FRTO,
 639                 .procname       = "tcp_frto",
 640                 .data           = &sysctl_tcp_frto,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_dointvec
 644         },
 645         {
 646                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 647                 .procname       = "tcp_frto_response",
 648                 .data           = &sysctl_tcp_frto_response,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 .proc_handler   = &proc_dointvec
 652         },
 653         {
 654                 .ctl_name       = NET_TCP_LOW_LATENCY,
 655                 .procname       = "tcp_low_latency",
 656                 .data           = &sysctl_tcp_low_latency,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec
 660         },
 661         {
 662                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 663                 .procname       = "ipfrag_secret_interval",
 664                 .data           = &ip4_frags_ctl.secret_interval,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec_jiffies,
 668                 .strategy       = &sysctl_jiffies
 669         },
 670         {
 671                 .procname       = "ipfrag_max_dist",
 672                 .data           = &sysctl_ipfrag_max_dist,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec_minmax,
 676                 .extra1         = &zero
 677         },
 678         {
 679                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 680                 .procname       = "tcp_no_metrics_save",
 681                 .data           = &sysctl_tcp_nometrics_save,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686         {
 687                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 688                 .procname       = "tcp_moderate_rcvbuf",
 689                 .data           = &sysctl_tcp_moderate_rcvbuf,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = &proc_dointvec,
 693         },
 694         {
 695                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 696                 .procname       = "tcp_tso_win_divisor",
 697                 .data           = &sysctl_tcp_tso_win_divisor,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = &proc_dointvec,
 701         },
 702         {
 703                 .ctl_name       = NET_TCP_CONG_CONTROL,
 704                 .procname       = "tcp_congestion_control",
 705                 .mode           = 0644,
 706                 .maxlen         = TCP_CA_NAME_MAX,
 707                 .proc_handler   = &proc_tcp_congestion_control,
 708                 .strategy       = &sysctl_tcp_congestion_control,
 709         },
 710         {
 711                 .ctl_name       = NET_TCP_ABC,
 712                 .procname       = "tcp_abc",
 713                 .data           = &sysctl_tcp_abc,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = &proc_dointvec,
 717         },
 718         {
 719                 .ctl_name       = NET_TCP_MTU_PROBING,
 720                 .procname       = "tcp_mtu_probing",
 721                 .data           = &sysctl_tcp_mtu_probing,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_dointvec,
 725         },
 726         {
 727                 .ctl_name       = NET_TCP_BASE_MSS,
 728                 .procname       = "tcp_base_mss",
 729                 .data           = &sysctl_tcp_base_mss,
 730                 .maxlen         = sizeof(int),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_dointvec,
 733         },
 734         {
 735                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 736                 .procname       = "tcp_workaround_signed_windows",
 737                 .data           = &sysctl_tcp_workaround_signed_windows,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_dointvec
 741         },
 742 #ifdef CONFIG_NET_DMA
 743         {
 744                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 745                 .procname       = "tcp_dma_copybreak",
 746                 .data           = &sysctl_tcp_dma_copybreak,
 747                 .maxlen         = sizeof(int),
 748                 .mode           = 0644,
 749                 .proc_handler   = &proc_dointvec
 750         },
 751 #endif
 752         {
 753                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 754                 .procname       = "tcp_slow_start_after_idle",
 755                 .data           = &sysctl_tcp_slow_start_after_idle,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = &proc_dointvec
 759         },
 760 #ifdef CONFIG_NETLABEL
 761         {
 762                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 763                 .procname       = "cipso_cache_enable",
 764                 .data           = &cipso_v4_cache_enabled,
 765                 .maxlen         = sizeof(int),
 766                 .mode           = 0644,
 767                 .proc_handler   = &proc_dointvec,
 768         },
 769         {
 770                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 771                 .procname       = "cipso_cache_bucket_size",
 772                 .data           = &cipso_v4_cache_bucketsize,
 773                 .maxlen         = sizeof(int),
 774                 .mode           = 0644,
 775                 .proc_handler   = &proc_dointvec,
 776         },
 777         {
 778                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 779                 .procname       = "cipso_rbm_optfmt",
 780                 .data           = &cipso_v4_rbm_optfmt,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = &proc_dointvec,
 784         },
 785         {
 786                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 787                 .procname       = "cipso_rbm_strictvalid",
 788                 .data           = &cipso_v4_rbm_strictvalid,
 789                 .maxlen         = sizeof(int),
 790                 .mode           = 0644,
 791                 .proc_handler   = &proc_dointvec,
 792         },
 793 #endif /* CONFIG_NETLABEL */
 794         {
 795                 .procname       = "tcp_available_congestion_control",
 796                 .maxlen         = TCP_CA_BUF_MAX,
 797                 .mode           = 0444,
 798                 .proc_handler   = &proc_tcp_available_congestion_control,
 799         },
 800         {
 801                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 802                 .procname       = "tcp_allowed_congestion_control",
 803                 .maxlen         = TCP_CA_BUF_MAX,
 804                 .mode           = 0644,
 805                 .proc_handler   = &proc_allowed_congestion_control,
 806                 .strategy       = &strategy_allowed_congestion_control,
 807         },
 808         {
 809                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 810                 .procname       = "tcp_max_ssthresh",
 811                 .data           = &sysctl_tcp_max_ssthresh,
 812                 .maxlen         = sizeof(int),
 813                 .mode           = 0644,
 814                 .proc_handler   = &proc_dointvec,
 815         },
 816         {
 817                 .ctl_name       = CTL_UNNUMBERED,
 818                 .procname       = "udp_mem",
 819                 .data           = &sysctl_udp_mem,
 820                 .maxlen         = sizeof(sysctl_udp_mem),
 821                 .mode           = 0644,
 822                 .proc_handler   = &proc_dointvec_minmax,
 823                 .strategy       = &sysctl_intvec,
 824                 .extra1         = &zero
 825         },
 826         {
 827                 .ctl_name       = CTL_UNNUMBERED,
 828                 .procname       = "udp_rmem_min",
 829                 .data           = &sysctl_udp_rmem_min,
 830                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 831                 .mode           = 0644,
 832                 .proc_handler   = &proc_dointvec_minmax,
 833                 .strategy       = &sysctl_intvec,
 834                 .extra1         = &zero
 835         },
 836         {
 837                 .ctl_name       = CTL_UNNUMBERED,
 838                 .procname       = "udp_wmem_min",
 839                 .data           = &sysctl_udp_wmem_min,
 840                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 841                 .mode           = 0644,
 842                 .proc_handler   = &proc_dointvec_minmax,
 843                 .strategy       = &sysctl_intvec,
 844                 .extra1         = &zero
 845         },
 846         { .ctl_name = 0 }
 847 };
 848
 849 struct ctl_path net_ipv4_ctl_path[] = {
 850         { .procname = "net", .ctl_name = CTL_NET, },
 851         { .procname = "ipv4", .ctl_name = NET_IPV4, },
 852         { },
 853 };
 854 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 855
 856 static __init int sysctl_ipv4_init(void)
 857 {
 858         struct ctl_table_header *hdr;
 859
 860         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 861         return hdr == NULL ? -ENOMEM : 0;
 862 }
 863
 864 __initcall(sysctl_ipv4_init);